A better meshflow doesn't necesarily mean more polygons. For example: http://img.photobucket.com/albums/v85/wheelchairninja/Model%20showcase/maleupdatewirefront.jpg(3012 faces) Now this model isn't perfect either but you can see how the lines are arranged (especially on the body) so they follow the features you want to highlight (muscles, wrinkles). I don't think you should change the whole model now because it would be alot of work but you might want to consider this for your next model(s).

About the skin, since the head is textured I thought the body is too. But if I understand you correctly it is just a single color material? If that's the case, forget my comment. I just thought you had unwrapped everything next to eachother but used a single color on the texture map which would be wastefull.